Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 215, Issue -, Pages 8-17Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2017.03.082
Keywords
Graphene-based photocatalyst; SnO2; Photochemical fabrication; Photodegradation; p-nitrophenol
Funding
- National Natural Science Foundation of China [21571068]
- Research Project of Chinese Ministry of Education [213029A]
- Natural Science Foundation of Guangdong Province [2015A030313387]
- Science and Technology Program of Guangzhou [201607010301]
- Special funds for Discipline Construction in Guangdong Province [2013KJCX0057]
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A room-temperature photochemical method was introduced to fabricate SnO2-reduced graphene oxide (SnO2-rGO) composite with a new type of structure. SnO2 dense layers were directly grown on the two sides of an rGO sheet through ultraviolet light (UV) irradiation of a mixed precursor solution of SnSO4, H2SO4, and graphene oxide for 6h. The composite possessed a novel flat flake-like structure consisting of two SnO2 dense layers and an rGO sheet sandwiched in between. In contrast to most graphene-based composites, the fabricated composite was non-flexible, wrinkle-free and rGO surfaces were completely covered. The composite could be used in photocatalysis and exhibited remarkably enhanced activity in degradation of p-nitrophenol under low intensity of UV light or sunlight. The activity was more than 12 times that of pure SnO2 and considerably higher than that of other SnO2-rGO composites. The dense layer immobilized the flat structure, promoted the photocatalytic activity, and maintained the long-term stability of the composite. After preservation of more than 12 months in ambient condition, the composite showed a nearly constant activity. This photochemical method can be used to fabricate graphene-based composites with regular structure, high performance, and long-term stability. (C) 2017 Elsevier B.V. All rights reserved.
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